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<div class="title">kiss_fft.h</div>  </div>
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<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno">    1</span>&#160;<span class="preprocessor">#ifndef KISS_FFT_H</span></div>
<div class="line"><a name="l00002"></a><span class="lineno">    2</span>&#160;<span class="preprocessor">#define KISS_FFT_H</span></div>
<div class="line"><a name="l00003"></a><span class="lineno">    3</span>&#160; </div>
<div class="line"><a name="l00004"></a><span class="lineno">    4</span>&#160;<span class="preprocessor">#include &lt;stdlib.h&gt;</span></div>
<div class="line"><a name="l00005"></a><span class="lineno">    5</span>&#160;<span class="preprocessor">#include &lt;stdio.h&gt;</span></div>
<div class="line"><a name="l00006"></a><span class="lineno">    6</span>&#160;<span class="preprocessor">#include &lt;math.h&gt;</span></div>
<div class="line"><a name="l00007"></a><span class="lineno">    7</span>&#160;<span class="preprocessor">#include &lt;string.h&gt;</span></div>
<div class="line"><a name="l00008"></a><span class="lineno">    8</span>&#160; </div>
<div class="line"><a name="l00009"></a><span class="lineno">    9</span>&#160;<span class="preprocessor">#if !defined(__APPLE__)</span></div>
<div class="line"><a name="l00010"></a><span class="lineno">   10</span>&#160;<span class="preprocessor">#include &lt;malloc.h&gt;</span></div>
<div class="line"><a name="l00011"></a><span class="lineno">   11</span>&#160;<span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00012"></a><span class="lineno">   12</span>&#160; </div>
<div class="line"><a name="l00013"></a><span class="lineno">   13</span>&#160;<span class="preprocessor">#include &lt;pcl/pcl_exports.h&gt;</span></div>
<div class="line"><a name="l00014"></a><span class="lineno">   14</span>&#160; </div>
<div class="line"><a name="l00015"></a><span class="lineno">   15</span>&#160;<span class="preprocessor">#ifdef __cplusplus</span></div>
<div class="line"><a name="l00016"></a><span class="lineno">   16</span>&#160;<span class="keyword">extern</span> <span class="stringliteral">&quot;C&quot;</span> {</div>
<div class="line"><a name="l00017"></a><span class="lineno">   17</span>&#160;<span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00018"></a><span class="lineno">   18</span>&#160; </div>
<div class="line"><a name="l00019"></a><span class="lineno">   19</span>&#160;<span class="comment">/*</span></div>
<div class="line"><a name="l00020"></a><span class="lineno">   20</span>&#160;<span class="comment"> ATTENTION!</span></div>
<div class="line"><a name="l00021"></a><span class="lineno">   21</span>&#160;<span class="comment"> If you would like a :</span></div>
<div class="line"><a name="l00022"></a><span class="lineno">   22</span>&#160;<span class="comment"> -- a utility that will handle the caching of fft objects</span></div>
<div class="line"><a name="l00023"></a><span class="lineno">   23</span>&#160;<span class="comment"> -- real-only (no imaginary time component ) FFT</span></div>
<div class="line"><a name="l00024"></a><span class="lineno">   24</span>&#160;<span class="comment"> -- a multi-dimensional FFT</span></div>
<div class="line"><a name="l00025"></a><span class="lineno">   25</span>&#160;<span class="comment"> -- a command-line utility to perform ffts</span></div>
<div class="line"><a name="l00026"></a><span class="lineno">   26</span>&#160;<span class="comment"> -- a command-line utility to perform fast-convolution filtering</span></div>
<div class="line"><a name="l00027"></a><span class="lineno">   27</span>&#160;<span class="comment"></span> </div>
<div class="line"><a name="l00028"></a><span class="lineno">   28</span>&#160;<span class="comment"> Then see kfc.h kiss_fftr.h kiss_fftnd.h fftutil.c kiss_fastfir.c</span></div>
<div class="line"><a name="l00029"></a><span class="lineno">   29</span>&#160;<span class="comment">  in the tools/ directory.</span></div>
<div class="line"><a name="l00030"></a><span class="lineno">   30</span>&#160;<span class="comment">*/</span></div>
<div class="line"><a name="l00031"></a><span class="lineno">   31</span>&#160; </div>
<div class="line"><a name="l00032"></a><span class="lineno">   32</span>&#160;<span class="preprocessor">#ifdef USE_SIMD</span></div>
<div class="line"><a name="l00033"></a><span class="lineno">   33</span>&#160;<span class="preprocessor"># include &lt;xmmintrin.h&gt;</span></div>
<div class="line"><a name="l00034"></a><span class="lineno">   34</span>&#160;<span class="preprocessor"># define kiss_fft_scalar __m128</span></div>
<div class="line"><a name="l00035"></a><span class="lineno">   35</span>&#160;<span class="preprocessor">#define KISS_FFT_MALLOC(nbytes) _mm_malloc(nbytes,16)</span></div>
<div class="line"><a name="l00036"></a><span class="lineno">   36</span>&#160;<span class="preprocessor">#define KISS_FFT_FREE _mm_free</span></div>
<div class="line"><a name="l00037"></a><span class="lineno">   37</span>&#160;<span class="preprocessor">#else   </span></div>
<div class="line"><a name="l00038"></a><span class="lineno">   38</span>&#160;<span class="preprocessor">#define KISS_FFT_MALLOC malloc</span></div>
<div class="line"><a name="l00039"></a><span class="lineno">   39</span>&#160;<span class="preprocessor">#define KISS_FFT_FREE free</span></div>
<div class="line"><a name="l00040"></a><span class="lineno">   40</span>&#160;<span class="preprocessor">#endif  </span></div>
<div class="line"><a name="l00041"></a><span class="lineno">   41</span>&#160; </div>
<div class="line"><a name="l00042"></a><span class="lineno">   42</span>&#160; </div>
<div class="line"><a name="l00043"></a><span class="lineno">   43</span>&#160;<span class="preprocessor">#ifdef FIXED_POINT</span></div>
<div class="line"><a name="l00044"></a><span class="lineno">   44</span>&#160;<span class="preprocessor">#include &lt;sys/types.h&gt;</span>  </div>
<div class="line"><a name="l00045"></a><span class="lineno">   45</span>&#160;<span class="preprocessor"># if (FIXED_POINT == 32)</span></div>
<div class="line"><a name="l00046"></a><span class="lineno">   46</span>&#160;<span class="preprocessor">#  define kiss_fft_scalar int32_t</span></div>
<div class="line"><a name="l00047"></a><span class="lineno">   47</span>&#160;<span class="preprocessor"># else  </span></div>
<div class="line"><a name="l00048"></a><span class="lineno">   48</span>&#160;<span class="preprocessor">#  define kiss_fft_scalar int16_t</span></div>
<div class="line"><a name="l00049"></a><span class="lineno">   49</span>&#160;<span class="preprocessor"># endif</span></div>
<div class="line"><a name="l00050"></a><span class="lineno">   50</span>&#160;<span class="preprocessor">#else</span></div>
<div class="line"><a name="l00051"></a><span class="lineno">   51</span>&#160;<span class="preprocessor"># ifndef kiss_fft_scalar</span></div>
<div class="line"><a name="l00052"></a><span class="lineno">   52</span>&#160;<span class="comment">/*  default is float */</span></div>
<div class="line"><a name="l00053"></a><span class="lineno">   53</span>&#160;<span class="preprocessor">#   define kiss_fft_scalar float</span></div>
<div class="line"><a name="l00054"></a><span class="lineno">   54</span>&#160;<span class="preprocessor"># endif</span></div>
<div class="line"><a name="l00055"></a><span class="lineno">   55</span>&#160;<span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00056"></a><span class="lineno">   56</span>&#160; </div>
<div class="line"><a name="l00057"></a><span class="lineno"><a class="line" href="structkiss__fft__cpx.html">   57</a></span>&#160;<span class="keyword">typedef</span> <span class="keyword">struct </span>{</div>
<div class="line"><a name="l00058"></a><span class="lineno">   58</span>&#160;    kiss_fft_scalar r;</div>
<div class="line"><a name="l00059"></a><span class="lineno">   59</span>&#160;    kiss_fft_scalar i;</div>
<div class="line"><a name="l00060"></a><span class="lineno">   60</span>&#160;}<a class="code" href="structkiss__fft__cpx.html">kiss_fft_cpx</a>;</div>
<div class="line"><a name="l00061"></a><span class="lineno">   61</span>&#160; </div>
<div class="line"><a name="l00062"></a><span class="lineno">   62</span>&#160;<span class="keyword">typedef</span> <span class="keyword">struct </span><a class="code" href="structkiss__fft__state.html">kiss_fft_state</a>* <a class="code" href="structkiss__fft__state.html">kiss_fft_cfg</a>;</div>
<div class="line"><a name="l00063"></a><span class="lineno">   63</span>&#160; </div>
<div class="line"><a name="l00064"></a><span class="lineno">   64</span>&#160;<span class="comment">/* </span></div>
<div class="line"><a name="l00065"></a><span class="lineno">   65</span>&#160;<span class="comment"> *  kiss_fft_alloc</span></div>
<div class="line"><a name="l00066"></a><span class="lineno">   66</span>&#160;<span class="comment"> *  </span></div>
<div class="line"><a name="l00067"></a><span class="lineno">   67</span>&#160;<span class="comment"> *  Initialize a FFT (or IFFT) algorithm&#39;s cfg/state buffer.</span></div>
<div class="line"><a name="l00068"></a><span class="lineno">   68</span>&#160;<span class="comment"> *</span></div>
<div class="line"><a name="l00069"></a><span class="lineno">   69</span>&#160;<span class="comment"> *  typical usage:      kiss_fft_cfg mycfg=kiss_fft_alloc(1024,0,NULL,NULL);</span></div>
<div class="line"><a name="l00070"></a><span class="lineno">   70</span>&#160;<span class="comment"> *</span></div>
<div class="line"><a name="l00071"></a><span class="lineno">   71</span>&#160;<span class="comment"> *  The return value from fft_alloc is a cfg buffer used internally</span></div>
<div class="line"><a name="l00072"></a><span class="lineno">   72</span>&#160;<span class="comment"> *  by the fft routine or NULL.</span></div>
<div class="line"><a name="l00073"></a><span class="lineno">   73</span>&#160;<span class="comment"> *</span></div>
<div class="line"><a name="l00074"></a><span class="lineno">   74</span>&#160;<span class="comment"> *  If lenmem is NULL, then kiss_fft_alloc will allocate a cfg buffer using malloc.</span></div>
<div class="line"><a name="l00075"></a><span class="lineno">   75</span>&#160;<span class="comment"> *  The returned value should be free()d when done to avoid memory leaks.</span></div>
<div class="line"><a name="l00076"></a><span class="lineno">   76</span>&#160;<span class="comment"> *  </span></div>
<div class="line"><a name="l00077"></a><span class="lineno">   77</span>&#160;<span class="comment"> *  The state can be placed in a user supplied buffer &#39;mem&#39;:</span></div>
<div class="line"><a name="l00078"></a><span class="lineno">   78</span>&#160;<span class="comment"> *  If lenmem is not NULL and mem is not NULL and *lenmem is large enough,</span></div>
<div class="line"><a name="l00079"></a><span class="lineno">   79</span>&#160;<span class="comment"> *      then the function places the cfg in mem and the size used in *lenmem</span></div>
<div class="line"><a name="l00080"></a><span class="lineno">   80</span>&#160;<span class="comment"> *      and returns mem.</span></div>
<div class="line"><a name="l00081"></a><span class="lineno">   81</span>&#160;<span class="comment"> *  </span></div>
<div class="line"><a name="l00082"></a><span class="lineno">   82</span>&#160;<span class="comment"> *  If lenmem is not NULL and ( mem is NULL or *lenmem is not large enough),</span></div>
<div class="line"><a name="l00083"></a><span class="lineno">   83</span>&#160;<span class="comment"> *      then the function returns NULL and places the minimum cfg </span></div>
<div class="line"><a name="l00084"></a><span class="lineno">   84</span>&#160;<span class="comment"> *      buffer size in *lenmem.</span></div>
<div class="line"><a name="l00085"></a><span class="lineno">   85</span>&#160;<span class="comment"> * */</span></div>
<div class="line"><a name="l00086"></a><span class="lineno">   86</span>&#160; </div>
<div class="line"><a name="l00087"></a><span class="lineno">   87</span>&#160;<a class="code" href="structkiss__fft__state.html">kiss_fft_cfg</a> PCL_EXPORTS </div>
<div class="line"><a name="l00088"></a><span class="lineno">   88</span>&#160;kiss_fft_alloc(<span class="keywordtype">int</span> nfft,<span class="keywordtype">int</span> inverse_fft,<span class="keywordtype">void</span> * mem,<span class="keywordtype">size_t</span> * lenmem); </div>
<div class="line"><a name="l00089"></a><span class="lineno">   89</span>&#160; </div>
<div class="line"><a name="l00090"></a><span class="lineno">   90</span>&#160;<span class="comment">/*</span></div>
<div class="line"><a name="l00091"></a><span class="lineno">   91</span>&#160;<span class="comment"> * kiss_fft(cfg,in_out_buf)</span></div>
<div class="line"><a name="l00092"></a><span class="lineno">   92</span>&#160;<span class="comment"> *</span></div>
<div class="line"><a name="l00093"></a><span class="lineno">   93</span>&#160;<span class="comment"> * Perform an FFT on a complex input buffer.</span></div>
<div class="line"><a name="l00094"></a><span class="lineno">   94</span>&#160;<span class="comment"> * for a forward FFT,</span></div>
<div class="line"><a name="l00095"></a><span class="lineno">   95</span>&#160;<span class="comment"> * fin should be  f[0] , f[1] , ... ,f[nfft-1]</span></div>
<div class="line"><a name="l00096"></a><span class="lineno">   96</span>&#160;<span class="comment"> * fout will be   F[0] , F[1] , ... ,F[nfft-1]</span></div>
<div class="line"><a name="l00097"></a><span class="lineno">   97</span>&#160;<span class="comment"> * Note that each element is complex and can be accessed like</span></div>
<div class="line"><a name="l00098"></a><span class="lineno">   98</span>&#160;<span class="comment">    f[k].r and f[k].i</span></div>
<div class="line"><a name="l00099"></a><span class="lineno">   99</span>&#160;<span class="comment"> * */</span></div>
<div class="line"><a name="l00100"></a><span class="lineno">  100</span>&#160;<span class="keywordtype">void</span> PCL_EXPORTS </div>
<div class="line"><a name="l00101"></a><span class="lineno">  101</span>&#160;kiss_fft(<a class="code" href="structkiss__fft__state.html">kiss_fft_cfg</a> cfg,<span class="keyword">const</span> <a class="code" href="structkiss__fft__cpx.html">kiss_fft_cpx</a> *fin,<a class="code" href="structkiss__fft__cpx.html">kiss_fft_cpx</a> *fout);</div>
<div class="line"><a name="l00102"></a><span class="lineno">  102</span>&#160; </div>
<div class="line"><a name="l00103"></a><span class="lineno">  103</span>&#160;<span class="comment">/*</span></div>
<div class="line"><a name="l00104"></a><span class="lineno">  104</span>&#160;<span class="comment"> A more generic version of the above function. It reads its input from every Nth sample.</span></div>
<div class="line"><a name="l00105"></a><span class="lineno">  105</span>&#160;<span class="comment"> * */</span></div>
<div class="line"><a name="l00106"></a><span class="lineno">  106</span>&#160;<span class="keywordtype">void</span> PCL_EXPORTS </div>
<div class="line"><a name="l00107"></a><span class="lineno">  107</span>&#160;kiss_fft_stride(<a class="code" href="structkiss__fft__state.html">kiss_fft_cfg</a> cfg,<span class="keyword">const</span> <a class="code" href="structkiss__fft__cpx.html">kiss_fft_cpx</a> *fin,<a class="code" href="structkiss__fft__cpx.html">kiss_fft_cpx</a> *fout,<span class="keywordtype">int</span> fin_stride);</div>
<div class="line"><a name="l00108"></a><span class="lineno">  108</span>&#160; </div>
<div class="line"><a name="l00109"></a><span class="lineno">  109</span>&#160;<span class="comment">/* If kiss_fft_alloc allocated a buffer, it is one contiguous </span></div>
<div class="line"><a name="l00110"></a><span class="lineno">  110</span>&#160;<span class="comment">   buffer and can be simply free()d when no longer needed*/</span></div>
<div class="line"><a name="l00111"></a><span class="lineno">  111</span>&#160;<span class="preprocessor">#define kiss_fft_free free</span></div>
<div class="line"><a name="l00112"></a><span class="lineno">  112</span>&#160; </div>
<div class="line"><a name="l00113"></a><span class="lineno">  113</span>&#160;<span class="comment">/*</span></div>
<div class="line"><a name="l00114"></a><span class="lineno">  114</span>&#160;<span class="comment"> Cleans up some memory that gets managed internally. Not necessary to call, but it might clean up </span></div>
<div class="line"><a name="l00115"></a><span class="lineno">  115</span>&#160;<span class="comment"> your compiler output to call this before you exit.</span></div>
<div class="line"><a name="l00116"></a><span class="lineno">  116</span>&#160;<span class="comment">*/</span></div>
<div class="line"><a name="l00117"></a><span class="lineno">  117</span>&#160;<span class="keywordtype">void</span> PCL_EXPORTS </div>
<div class="line"><a name="l00118"></a><span class="lineno">  118</span>&#160;kiss_fft_cleanup(<span class="keywordtype">void</span>);</div>
<div class="line"><a name="l00119"></a><span class="lineno">  119</span>&#160; </div>
<div class="line"><a name="l00120"></a><span class="lineno">  120</span>&#160;<span class="comment">/*</span></div>
<div class="line"><a name="l00121"></a><span class="lineno">  121</span>&#160;<span class="comment"> * Returns the smallest integer k, such that k&gt;=n and k has only &quot;fast&quot; factors (2,3,5)</span></div>
<div class="line"><a name="l00122"></a><span class="lineno">  122</span>&#160;<span class="comment"> */</span></div>
<div class="line"><a name="l00123"></a><span class="lineno">  123</span>&#160;<span class="keywordtype">int</span> PCL_EXPORTS </div>
<div class="line"><a name="l00124"></a><span class="lineno">  124</span>&#160;kiss_fft_next_fast_size(<span class="keywordtype">int</span> n);</div>
<div class="line"><a name="l00125"></a><span class="lineno">  125</span>&#160; </div>
<div class="line"><a name="l00126"></a><span class="lineno">  126</span>&#160;<span class="comment">/* for real ffts, we need an even size */</span></div>
<div class="line"><a name="l00127"></a><span class="lineno">  127</span>&#160;<span class="preprocessor">#define kiss_fftr_next_fast_size_real(n) \</span></div>
<div class="line"><a name="l00128"></a><span class="lineno">  128</span>&#160;<span class="preprocessor">        (kiss_fft_next_fast_size( ((n)+1)&gt;&gt;1)&lt;&lt;1)</span></div>
<div class="line"><a name="l00129"></a><span class="lineno">  129</span>&#160; </div>
<div class="line"><a name="l00130"></a><span class="lineno">  130</span>&#160;<span class="preprocessor">#ifdef __cplusplus</span></div>
<div class="line"><a name="l00131"></a><span class="lineno">  131</span>&#160;} </div>
<div class="line"><a name="l00132"></a><span class="lineno">  132</span>&#160;<span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00133"></a><span class="lineno">  133</span>&#160; </div>
<div class="line"><a name="l00134"></a><span class="lineno">  134</span>&#160;<span class="preprocessor">#endif</span></div>
<div class="ttc" id="astructkiss__fft__cpx_html"><div class="ttname"><a href="structkiss__fft__cpx.html">kiss_fft_cpx</a></div><div class="ttdef"><b>Definition:</b> kiss_fft.h:57</div></div>
<div class="ttc" id="astructkiss__fft__state_html"><div class="ttname"><a href="structkiss__fft__state.html">kiss_fft_state</a></div><div class="ttdef"><b>Definition:</b> _kiss_fft_guts.h:28</div></div>
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